Compaq 21264, EV67 specifications Index-9

PALcode

conditional branches in, D–14described, 6–1

entries points for, 6–12exception entry points, 6–13guidelines for, D–1HW_LD instruction, 6–3HW_MFPR instruction, 6–6HW_MTPR instruction, 6–6HW_RET instruction, 6–5HW_ST instruction, 6–4required function codes, 6–3reserved opcodes for, 6–3restrictions for, D–1

PALmode environment, 6–2

PALshadow registers, 6–11

PCTR_CTL performance counter control counter register

updating, D–17

PCTR_CTL performance counter control register, 5–23

at power-on reset state, 7–15updating, D–18

PCTX Ibox process context register, 5–21

after fault reset, 7–8after warm reset, 7–11

at power-on reset state, 7–15through sleep mode, 7–10

Phase-lock loop. See PLL

Physical address considerations, 4–4

Pipeline

abort delay, 2–16Dcache access, 2–16Ebox execution, 2–16Ebox slotting, 2–18Fbox execution, 2–16instruction fetch, 2–14instruction group definitions, 2–17instruction issue rules, 2–16instruction latencies, 2–20instruction retire rules, 2–21instruction slot, 2–14

issue queue, 2–15organization, 2–13register maps, 2–15register reads, 2–16

PLL

description, 7–19output clocks, 7–19ramp up, 7–6

PLL_IDD, values for, 9–3

PLL_VDD signal pin, 3–5

PLL_VDD, values for, 9–3

PllBypass_H signal pin, 3–5

PMPC ProfileMe register, 5–8

Ports

IEEE 1149.1, 11–3serial terminal, 11–2SROM load, 11–2

Power

maximum, 9–1sleep defined, 9–3

Power supply sequencing, 9–5

Power-on

flow signals and constraints, 7–7reset flow, 7–1

self-test and initialization, 11–5timing sequence, 7–3

PRB_TAG_ONLY Cbox CSR, 4–28defined, 5–34

Privileged architecture library code See PALcode

Probe commands, system, 4–26 ,4–40

Probe queue, 2–11

PROBE_BC_ERR error status in C_STAT, 5–41

ProbeResponse, 21264/EV67 command, 4–21 ,4–24 ,4–39

ProfileMe mode, 6–20

Push-pull output clock driver. See O_PP_CLK Push-pull output driver. See O_PP

R

R31

load instructions with, 2–23retire instructions with, 2–22speculative loads to, 2–25

RAMP1 reset machine state, 7–17RAMP2 reset machine state, 7–18Ranges and extents convention, xxi RdBlk, 21264/EV67 command, 4–39RdBlkI, 21264/EV67 command, 4–39RdBlkMod, 21264/EV67 command, 4–39RdBlkModSpec, 21264/EV67 command, 4–39RdBlkModVic, 21264/EV67 command, 4–39RdBlkSpec, 21264/EV67 command, 4–39RdBlkSpecI, 21264/EV67 command, 4–39RdBlkVic, 21264/EV67 command, 4–39RdBlkVicI, 21264/EV67 command, 4–39RdBytes, 21264/EV67 command, 4–39RdLWs, 21264/EV67 command, 4–39RdQWs, 21264/EV67 command, 4–39

RDVIC_ACK_INHIBIT Cbox CSR, 4–25 ,4–26defined, 5–34

Alpha 21264/EV67 Hardware Reference Manual Index–9